Stella v4.7.2 changelog:
* Fixed bug when entering and exiting the debugger; sometimes the
character corresponding to the '`' key would be output in the
prompt area.
* Updated DPC+ Thumb ARM emulation code to latest from David Welch.
In particular, this fixes incorrect handling of the V flag when
adding and subtracting, but also fixes compile-time warnings that
I couldn't get rid of before.
* Updated UNIX configure script to work with GCC 6.x compilers, and to
remove references to obsolete compiler versions that can no longer
be used to compile Stella.